sin (A-B)与-cos (A-B) 有什么联系

sin (A-B)与-cos (A-B) 有什么联系 化简COS(a+B)COS(a-B)+sin平方B 化简cos(a+b)cos(a-b)+sin^2b cos(a+b)+cos(a-b)/sin(a+b)+sin(a-b)化简 化简 cos(a-b)cos(a+b)+sin(a-b)sin(a+b). cos(a-b)cos(a+b)+sin(a-b)sin(a+b)化简, 如何证明sin(a+b)=sin(a)cos(b)+cos(α)sin(b) sin(a+B)cos(y-B)-cos(B+a)sin(B-y) 化简 sin（a+B)sin(B-y)-cos(a-B)cos(y-B) 化简 cos(a-b)cos(b-c)+sin(a-b)sin(b-c)= sin（a-b）sin（b-r）-cos（a-b）cos（r-b) 化简,sin(a+b)cos(r-b)-cos(b+a)sin(b-r) 化简 ：sin(a+b)cos(r-b)-cos(b+a)sin(b-r) sin(a-b)sin(b-r)-cos(a-b)cos(r-b)sin(a+b)cos(r-b)-cos(b+a)sin(b-r) 和 sin(a-b)sin(b-r)-cos(a-b)cos(r-b) cos^2a-cos^2b=m,那么sin(a+b)sin(a-b)=? cos²a-cos²b=c,则sin(a+b)sin(a-b)= 证明sin(A+B)sin(A-B)=cos^2B-cos^2A cos∧a-cos∧b=t则sin(a+b)sin(a-b)= 化简cos(a-B)cos(a-y)-sin(a-B)sin(y-a)